reducing code using templated functions

debugcn Published at Dev

G.S

I have 2 templated functions (overloaded) with similar functionality except for one line of difference in the function body and one extra function argument. Is it possible to combine the functions further to avoid the duplicate code

template <class T> int MyClass::function1(string name, T& value)
{
   // same lines
   // if statement
   // statement to execute
   // else
   // different line, calls another function

   return 1;
}

template <class T> int MyClass::function1(string name, T& value,
                                          T defaultValue)
{
   // same lines
   // if statement
   // statement to execute
   // else
   // different line, assign default value to value

   return 1;
}

Carlton

You could give defaultValue a default argument:

template <class T> int MyClass::function1(string name, T& value,
                                          T defaultValue = T() )
{
   if (defaultValue == T() )
      //Do something
   else
      //Do something else

   return 1;
}

This way you can call the function with either two or three arguments, but the code will be able to tell how many were supplied. You may need to pick a different value for the default parameter, depending on your situation.

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